These addressable (smart) LEDs are very common. Using a single pin, hundreds of LEDs can be set to any color. Those smart LEDs have a small processor (WS2812) built inside of them. An incoming digital signal sets each LED to a specific color. This way, several LEDs can be controlled using a single pin.
When the user sets the color to one the connected LED, BrainPad holds the color state for each LED in its internal memory.
NeoClear() # clear all pixels (in memory) NeoSet(1,255,0,0) # set second LED to full red
When ready, all LEDs can be updated at once using NeoShow(). This function needs which pin is being used and how many LED to update.
NeoShow(1, 8) # Updates the 8 connected LEDs on pin 1
To determine the color value, use search the web for “Color picker” and use the hex value. Note that the websites use # to mark a hex value, but in coding we typically use 0x.
How small can a processor be? We are now talking about a processor that is smaller than an ant! Here is a fun fact, a processor is usually smaller than the packaging around it. The packaging is made larger so it can be handled easier.